include/linux/iommu-common.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_IOMMU_COMMON_H
   3 #define _LINUX_IOMMU_COMMON_H
   4
   5 #include <linux/spinlock_types.h>
   6 #include <linux/device.h>
   7 #include <asm/page.h>
   8
   9 #define IOMMU_POOL_HASHBITS     4
  10 #define IOMMU_NR_POOLS          (1 << IOMMU_POOL_HASHBITS)
  11 #define IOMMU_ERROR_CODE        (~(unsigned long) 0)
  12
  13 struct iommu_pool {
  14         unsigned long   start;
  15         unsigned long   end;
  16         unsigned long   hint;
  17         spinlock_t      lock;
  18 };
  19
  20 struct iommu_map_table {
  21         unsigned long           table_map_base;
  22         unsigned long           table_shift;
  23         unsigned long           nr_pools;
  24         void                    (*lazy_flush)(struct iommu_map_table *);
  25         unsigned long           poolsize;
  26         struct iommu_pool       pools[IOMMU_NR_POOLS];
  27         u32                     flags;
  28 #define IOMMU_HAS_LARGE_POOL    0x00000001
  29 #define IOMMU_NO_SPAN_BOUND     0x00000002
  30 #define IOMMU_NEED_FLUSH        0x00000004
  31         struct iommu_pool       large_pool;
  32         unsigned long           *map;
  33 };
  34
  35 extern void iommu_tbl_pool_init(struct iommu_map_table *iommu,
  36                                 unsigned long num_entries,
  37                                 u32 table_shift,
  38                                 void (*lazy_flush)(struct iommu_map_table *),
  39                                 bool large_pool, u32 npools,
  40                                 bool skip_span_boundary_check);
  41
  42 extern unsigned long iommu_tbl_range_alloc(struct device *dev,
  43                                            struct iommu_map_table *iommu,
  44                                            unsigned long npages,
  45                                            unsigned long *handle,
  46                                            unsigned long mask,
  47                                            unsigned int align_order);
  48
  49 extern void iommu_tbl_range_free(struct iommu_map_table *iommu,
  50                                  u64 dma_addr, unsigned long npages,
  51                                  unsigned long entry);
  52
  53 #endif